Memcached::getDelayed

Description

Memcached::getDelayed() issues a request to memcache for
multiple items the keys of which are specified in the
keys array. The method does not wait for response
and returns right away. When you are ready to collect the items, call
either Memcached::fetch() or
Memcached::fetchAll(). If with_cas
is true, the CAS token values will also be requested.

Instead of fetching the results explicitly, you can specify a result callback via
value_cb parameter.